Performance of lambs grazing an annual Mediterranean pasture or fed supplements based on olive oil cake or maize and its influence on system outputs
Raul R. Vera A D , Claudio Aguilar A , Paula Toro A , Fernando Squella B and Patricio Perez C
+ Author Affiliations
- Author Affiliations
A Departamento de Ciencias Animales, Facultad de Agronomia e Ingenieria Forestal, Pontificia Universidad Catolica de Chile, Santiago, Chile.
B Centro Experimental Hidango, Instituto de Investigaciones Agropecuarias, Litueche, Chile.
C Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santiago, Chile.
D Corresponding author. Email: rvi.2005@gmail.com
Animal Production Science 53(6) 516-522 https://doi.org/10.1071/AN12055
Submitted: 16 February 2012 Accepted: 12 November 2012 Published: 2 April 2013
Abstract
Three lamb feeding strategies were compared, including finishing of suckling lambs on an annual Mediterranean pasture (GRAZE), weaned followed by a concentrate plus hay diet (CONC), or weaned and fed a concentrate with 33% dry olive oil cake plus hay (CAKE). Grazing lambs averaged a liveweight gain of 334 g/day during the 28-day experimental period, which was higher (P < 0.05) than that of CONC and CAKE (283 and 276 g/day, respectively); however, there were no differences in empty body or dressed carcasses weights due to dietary treatment. The feed conversion of the olive seed cake supplement (kg supplement/kg gain) was lower (P < 0.01) than that of the maize-based supplement. Despite some significant differences between carcasses traits, all were small and of little commercial consequence. Simulation modelling of whole-system performance suggested that early weaning of lambs followed by concentrate feeding would reduce the finishing period, marginally increase the liveweight of ewes and would have little effect on pasture availability. It was further concluded that olive oil cake can be a large proportion of concentrate diets without negatively affecting carcass quality.
Additional keywords: annual pasture, carcass quality, finishing, lamb, simulation.
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